如图所示电路,打算用运放和MOS管做一个线性可调直流转换器,例如:正相输入1.5V,MOS管S极输出3V。但是实际使用中发现输出电压有纹波,大约在负载50mA时纹波最大越有300mV,140kHz。负载小或大一些,纹波会减小。
用LMV358替换TLV333后,纹波在负载为200mA时最大约为150mV,700+kHz。负载小或大一些,纹波会减小。
换LMV358后 200mA负载时的纹波:
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